CLOSED: Any idea what this could be?

Gent, Belgium(Zone 8a)

I noticed it on the backside of an oak leaf and was wondering if it could be the egg nursery room of an insect?..

Thumbnail by bonitin
Sinks Grove, WV

I suspect that these are galls caused by a tiny wasp in the family Cynipidae. A similar gall, called a saucer gall (caused by Andricus gigas), occurs on some oak species in the USA - see http://waynesword.palomar.edu/images/gall10b.jpg

Gent, Belgium(Zone 8a)

Thank you Suunto! I think I now found mine.
It is Neuroterus laeviusculus

The colours can vary..

http://www.plantsystematics.org/taxpage/0/0/79/binomial/Neuroterus%20laeviusculus.html

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